Effect of Plant Residue Amendments and Chemical Treatments Upon the Inoculum Potential of Cylindrocladium floridanum in Soil

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Abstract
Microsclerotia of C. floridanum germinated more frequently in the vicinity of all plant amendments tested than in nonamended soil. The fungus exhibited characteristics of a competitive soil saprophyte and was capable of colonizing all buried crop amendments tested in 4 soils. Residues of plants susceptible to root infection by C. floridanum and propylene oxide-sterilized plant residues were colonized most frequently. Buried grass significantly increased the inoculum potentials of C. floridanum in field plots located on 2 different soil types. Ground corn cobs did not affect the inoculum potential of C. floridanum in plots on 1 soil type. Trichlorodinitrobenzene and methyl bromide treatments prior to infestation of soil with C. floridanum had little effect upon C. floridanum inoculum potentials in amended plots.